Forming die forging manufacturing method of gas turbine disc

Abstract

The invention provides a loose tooling forging manufacturing method of a gas turbine disc, which comprises the following steps of: heating a cast ingot for upsetting and drawing to obtain a forged rod; the forging rod is heated to the pre-forging temperature, pre-forging is conducted in a pre-forging lower forming die, and pre-forging comprises the steps that overall downward pressing is conducted firstly, then centering downward pressing is conducted through a punch, and a pre-forged piece is obtained; carrying out homogenizing heat treatment on the pre-forged piece; and the pre-forged piece obtained after homogenizing heat treatment is heated to the finish forging temperature, finish forging is carried out in a finish forging lower forming die, the finish forging comprises the steps that centering pressing is carried out through a punch, then spinning is carried out through a square anvil, and the gas turbine disc piece is obtained. According to the loose tooling forging method of the gas turbine disc, net forming of the disc is directly achieved, grain structures are uniform, no deformation dead zone exists, production can be achieved through a 5000T hydraulic machine, the tonnage requirement of forging equipment is greatly reduced, material consumption is reduced, and the production cost is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material processing and forming, and relates to a method for manufacturing a gas turbine disc, and in particular to a die forging method for manufacturing a gas turbine disc. Background Art

[0002] Gas turbine is an advanced and complex set of power machinery equipment with a wide range of uses. It plays an important role in the fields of electricity, industry, ships and land transportation. It is a technology-intensive product that integrates new technologies, new materials and new processes. The development level of gas turbine manufacturing technology is often regarded as one of the important signs of a country's high-tech level and scientific and technological strength. In a gas turbine, the turbine disc is a core hot end component that withstands high temperature and high stress. It needs to withstand various stresses for a long time and the working environment is very harsh. Gas turbine discs often use high-temperature alloys as raw materials. They contain more alloy elements, and the degree of casting segregation and deformation resistance are large. Therefore, the requirements for hot processing process control are extremely strict. High-power heavy-duty gas turbines require larger-sized high-temperature alloy turbine discs for bearing, but the manufacturing of ultra-large high-temperature alloy gas turbine turbine discs is extremely difficult. During the production process, the composition, organization, performance and processing equipment capabilities must be comprehensively considered.

[0003] There are two main manufacturing methods for gas turbine discs: free forging and die forging. Free forging is more flexible and the forging equipment is relatively simple, but the free forging process is more expensive, the raw material utilization rate is usually only 25%, and the forging is easily exposed after streamline machining, which affects the product performance. The product performance of the die forging process is better, which is conducive to improving the consistency of the organization of different parts, but for ultra-large gas turbine discs, large-tonnage die forging machines are required for forging, and the tonnage is even above 50,000 tons. The production cost is extremely high, the production conditions are harsh, and the insufficient capacity of forging equipment is an important factor restricting the development of die forging technology. For example, CN118272628A discloses a large turbine disc forging and a preparation method thereof. After the steel ingot is blanked, a die forging press is used to perform upsetting, preform making and final forging in sequence, and then post-heat treatment is performed. This method uses die forging to manufacture the wheel disc, uses a 10,000-30,000-ton hydraulic press, and has high equipment requirements.

[0004] CN113458308A discloses a method for realizing extreme forming of super-large turbine disk forgings. The method performs pre-die forging on the center part and final die forging on the edge part. However, the method has high requirements on the die structure, making the production process more complicated.

[0005] CN115921734A discloses a local forming manufacturing method for a high-temperature alloy GH738 turbine disk. This method pre-treats the blank, heats it in a jacket, and then performs a roughening process. It then uses an arc anvil and a rectangular anvil for local rotary forging to form it, and finally performs a heat treatment. This method uses a local forging process and achieves a better forming effect, but is not conducive to the uniformity of the overall grain and structure of the turbine disk.

[0006] Therefore, based on the deficiencies of the prior art, the present invention provides a die forging manufacturing method for a gas turbine disc. Summary of the invention

[0007] The object of the present invention is to provide a die forging manufacturing method for a gas turbine disc, which adopts a die forging process to achieve net forming of large-sized gas turbine discs, achieve uniformity of disc structure, and reduce material loss and tonnage requirements of forming equipment.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] The present invention provides a die forging manufacturing method for a gas turbine disc, the die forging manufacturing method comprising the following steps:

[0010] (1) heating the ingot and performing upsetting to obtain a forged rod;

[0011] (2) cutting the forging rod, heating it to a pre-forging temperature, and pre-forging it in a pre-forging lower die, wherein the pre-forging includes first pressing the forging rod as a whole along the length direction with a press, and then pressing it in the center with a punch to obtain a pre-forged part;

[0012] (3) subjecting the pre-forged part to homogenization heat treatment;

[0013] (4) The pre-forged piece after the homogenization heat treatment is heated to the final forging temperature, and final forging is performed in a final forging lower die. The final forging includes first pressing the pre-forged piece in the height direction with the punch, and then spinning it with a square anvil to obtain the gas turbine disc.

[0014] The die forging manufacturing method provided by the present invention firstly performs pre-forging of the die, roughens one end of the forging rod, performs center pre-forming with a punch, and obtains a pre-forged part with uniform grain structure after homogenization heat treatment. Then, in the final forging process, the net forming of the disc is achieved through local forming. The obtained disc has uniform grains and structure, a grain size of 3-4, and no deformation dead zone. Compared with the prior art, production can be achieved using a 5000T hydraulic press, which greatly reduces the tonnage demand of forging equipment, reduces material loss, and greatly reduces production costs.

[0015] Preferably, the upsetting in step (1) is performed 2-4 times, for example, 3 times, 4 times and 5 times.

[0016] Preferably, the deformation of a single upsetting pass in step (1) is 30-40%, for example, 30%, 32%, 34%, 35%, 36%, 38% or 40%, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0017] Preferably, the diameter of the forged rod in step (1) is 450-480 mm, for example, 450 mm, 455 mm, 460 mm, 465 mm, 470 mm, 475 mm or 480 mm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0018] Preferably, the pre-forging temperature in step (2) is 1000-1050°C, for example, it can be 1000°C, 1005°C, 1010°C, 1015°C, 1020°C, 1025°C, 1030°C, 1035°C, 1040°C, 1045°C or 1050°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0019] Preferably, the holding time of the pre-forging temperature in step (2) is 0.5-0.8 min / mm based on the length of the forged rod, for example, it can be 0.5 min / mm, 0.55 min / mm, 0.6 min / mm, 0.65 min / mm, 0.7 min / mm, 0.75 min / mm or 0.8 min / mm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0020] Preferably, in the pre-forging of step (2), the temperature of the pre-forging lower tire mold is 200-300°C, for example, it can be 200°C, 220°C, 240°C, 250°C, 260°C, 280°C or 300°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0021] Preferably, the inner cavity shape of the pre-forging lower tire mold in step (2) is divided into an upper frustum and a lower frustum, the upper diameter of the upper frustum is larger than the lower diameter, the upper diameter of the lower frustum is larger than the lower diameter, and the lower diameter of the upper frustum is the same as the upper diameter of the lower frustum.

[0022] Preferably, the upper diameter of the upper cone of the pre-forging lower tire mold inner cavity is 700-720 mm, for example, it can be 700 mm, 705 mm, 710 mm, 715 mm or 720 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0023] Preferably, the lower diameter of the upper cone of the pre-forging lower tire mold cavity is 470-500mm, for example, it can be 470mm, 475mm, 480mm, 485mm, 490mm, 495mm or 500mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] Preferably, the lower diameter of the lower cone of the pre-forging lower tire mold cavity is 440-470 mm, for example, it can be 440 mm, 445 mm, 450 mm, 455 mm, 460 mm, 465 mm or 470 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0025] Preferably, the height of the lower cone of the inner cavity of the pre-forging lower tire mold is 280-310 mm, for example, it can be 280 mm, 285 mm, 290 mm, 295 mm, 300 mm, 305 mm or 310 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0026] Preferably, the height of the inner cavity of the pre-forging lower tire mold is 380-410 mm, for example, it can be 380 mm, 385 mm, 390 mm, 395 mm, 400 mm, 405 mm or 410 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0027] Preferably, the overall downward pressure in step (2) is 480-520 mm, for example, it can be 480 mm, 485 mm, 490 mm, 495 mm, 500 mm, 505 mm, 510 mm, 515 mm or 520 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0028] Preferably, the forming part of the punch in step (2) is in the shape of a frustum, and the upper diameter of the frustum is larger than the lower diameter.

[0029] Preferably, the upper diameter of the cone of the punch forming part is 480-520 mm, for example, it can be 480 mm, 485 mm, 490 mm, 495 mm, 500 mm, 505 mm, 510 mm, 515 mm or 520 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0030] Preferably, the lower diameter of the cone of the punch forming part is 330-350 mm, for example, it can be 330 mm, 335 mm, 340 mm, 345 mm or 350 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0031] Preferably, the pressing speed of the centering downward pressing in step (2) is 40-50 mm / s, for example, it can be 40 mm / s, 42 mm / s, 44 mm / s, 45 mm / s, 46 mm / s, 48 ​​mm / s or 50 mm / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0032] Preferably, the amount of downward pressure on the centering in step (2) is 30-50 mm, for example, it can be 30 mm, 32 mm, 35 mm, 38 mm, 40 mm, 42 mm, 45 mm, 48 mm or 50 mm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0033] Preferably, the temperature of the homogenization heat treatment in step (3) is 980-1020°C, for example, it can be 980°C, 985°C, 990°C, 995°C, 1000°C, 1005°C, 1010°C, 1015°C or 1020°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0034] Preferably, the holding time of the homogenization heat treatment in step (3) is 0.5-0.8 min / mm + (1.8-2.2) h based on the height of the pre-forging, for example, it can be 0.5 min / mm + 1.8 h, 0.6 min / mm + 1.8 h, 0.8 min / mm + 1.8 h, 0.5 min / mm + 2.0 h, 0.6 min / mm + 2.0 h, 0.8 min / mm + 2.0 h, 0.5 min / mm + 2.2 h, 0.6 min / mm + 2.2 h or 0.8 min / mm + 2.2 h, but is not limited to the listed values, and other values ​​not listed within the numerical range are equally applicable.

[0035] Preferably, the final forging temperature in step (4) is 960-1000°C, for example, it can be 960°C, 965°C, 970°C, 975°C, 980°C, 985°C, 990°C, 995°C or 1000°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0036] Preferably, the holding time of the final forging temperature in step (4) is 0.5-0.8 min / mm based on the height of the pre-forged piece, for example, it can be 0.5 min / mm, 0.55 min / mm, 0.6 min / mm, 0.65 min / mm, 0.7 min / mm, 0.75 min / mm or 0.8 min / mm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0037] Preferably, in the final forging in step (4), the temperature of the tire mold under the final forging is 200-300°C, for example, it can be 200°C, 220°C, 240°C, 250°C, 260°C, 280°C or 300°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0038] Preferably, the inner cavity shape of the final forging lower tire mold in step (4) is divided into an upper frustum and a lower frustum, the upper diameter of the upper frustum is larger than the lower diameter, the upper diameter of the lower frustum is larger than the lower diameter, and the lower diameter of the upper frustum is the same as the upper diameter of the lower frustum.

[0039] Preferably, the upper diameter of the upper cone of the inner cavity of the final forging lower tire mold is 780-820mm, for example, it can be 780mm, 785mm, 790mm, 795mm, 800mm, 805mm, 810mm, 815mm or 820mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0040] Preferably, the lower diameter of the upper cone of the inner cavity of the final forging lower tire mold is 510-540mm, for example, it can be 510mm, 515mm, 520mm, 525mm, 530mm, 535mm or 540mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0041] Preferably, the lower diameter of the lower cone of the inner cavity of the final forging lower tire mold is 490-520 mm, for example, it can be 490 mm, 495 mm, 500 mm, 505 mm, 510 mm, 515 mm or 520 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0042] Preferably, the height of the lower cone of the inner cavity of the final forging lower tire mold is 200-230 mm, for example, it can be 200 mm, 205 mm, 210 mm, 215 mm, 220 mm, 225 mm or 230 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0043] Preferably, the inner cavity height of the final forging lower tire mold is 320-350 mm, for example, it can be 320 mm, 325 mm, 330 mm, 335 mm, 340 mm, 345 mm or 350 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0044] Preferably, the speed of the centering downward pressure in step (4) is 40-50 mm / s, for example, it can be 40 mm / s, 42 mm / s, 44 mm / s, 45 mm / s, 46 mm / s, 48 ​​mm / s or 50 mm / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0045] Preferably, the amount of downward pressure in the centering in step (4) is 150-170 mm, for example, it can be 150 mm, 155 mm, 160 mm, 165 mm or 170 mm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0046] Preferably, the width of the square anvil in step (4) is 490-510 mm, for example, 490 mm, 495 mm, 500 mm, 505 mm or 510 mm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0047] Preferably, the raw material of the gas turbine disc comprises a high-temperature alloy GH2132, and the composition, by mass percentage, comprises: Ni 24.00-27.00wt%, Mo 1.00-1.50wt%, Cr 13.50-16.00wt%, Ti1.90-2.35wt%, V0.10-0.50wt%, B 0.003-0.010wt%, C≤0.08wt%, Si≤0.30wt%, Mn≤0.25wt%, P≤0.25wt%, S≤0.25wt%, Al≤0.35wt%, Cu≤0.50wt%, Co≤1.00wt%, and the balance is Fe.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] The present invention provides a die forging method for a gas turbine disc, which directly realizes the net forming of the disc, has uniform grain structure, and has no deformation dead zone. The production can be realized by using a 5000T hydraulic press, which greatly reduces the tonnage requirement of forging equipment, reduces material loss, and greatly reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a process flow diagram of a tire die forging process of a tire die forging manufacturing method provided in Example 1;

[0051] Figure 2 This is the equivalent strain diagram of the gas turbine disk prepared in Example 1. DETAILED DESCRIPTION

[0052] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0053] Example 1

[0054] This embodiment provides a die forging manufacturing method for a gas turbine disc.

[0055] In this embodiment, the raw material of the gas turbine disc is high temperature alloy GH2132 material.

[0056] In this embodiment, a φ630 mm ingot is used as the forging raw material for the gas turbine disk, and the ingot is prepared by induction furnace melting (IM), ladle refining (LF), vacuum degassing (VD) and consumable electrode melting (VAR) processes.

[0057] In this embodiment, the net weight of the prepared gas turbine disc forging is 1600 kg.

[0058] The tire die forging manufacturing method comprises the following steps:

[0059] (1) Cutting and chamfering the ingot;

[0060] (2) The ingot is heated and subjected to three upsetting passes, with a deformation of 35% in a single upsetting pass. During the upsetting process, the lengthening reduction in a single pass is 90 mm. After the upsetting process, the ingot is air-cooled and forged into a φ450 mm forged bar.

[0061] (3) Cutting, peeling and chamfering the forged bars;

[0062] (4) The forged rod is heated to 1020°C, and the holding time is 0.6 min / mm based on the length of the forged rod. The forged rod is placed vertically in the pre-forging lower mold along the length direction. The temperature under the pre-forging lower mold is 250°C. A 5000T hydraulic press is used to press the forged rod as a whole, and the pressing amount is 500 mm;

[0063] The inner diameter of the top surface of the pre-forging lower tire mold is φ710mm, the inner diameter of the bottom surface is φ456mm, the overall height of the pre-forging lower tire mold is 395mm, and the inner cavity shape is divided into an upper frustum and a lower frustum. The upper diameter of the upper frustum is φ710mm and the lower diameter is φ485mm. The upper diameter of the lower frustum is φ485mm and the lower diameter is φ456mm. The height of the lower frustum is 295mm.

[0064] (5) Then, a punch is used in the pre-forging lower die to press the forging rod in the center at a pressing speed of 45 mm / s and a pressing amount of 40 mm to obtain a pre-forged part;

[0065] The upper surface diameter of the punch is φ500mm, the lower surface diameter is φ340mm, the shape is divided into an upper cylindrical part and a lower truncated cone, the overall height of the punch is 200mm, and the height of the truncated cone part is 88mm;

[0066] (6) subjecting the pre-forging to homogenization heat treatment at a temperature of 1000° C. and a holding time of 0.6 min / mm+2 h based on the height of the pre-forging;

[0067] (7) machining a φ100×50 mm positioning blind hole at the center of the lower end face of the pre-forging, heating the pre-forging to 980° C., holding time based on the height of the pre-forging at 0.6 min / mm, vertically placing the pre-forging into the final forging lower die along the height direction, heating the temperature of the final forging lower die to 250° C., pressing down with the punch at a speed of 45 mm / s, with a pressing amount of 160 mm, and removing the punch;

[0068] The final forging lower tire mold includes a tire mold and a tire mold lower pad. The inner diameter of the tire mold top surface is φ800mm, the inner diameter of the bottom surface is φ508mm, the inner cavity height of the final forging lower tire mold is 338mm, and the inner cavity shape of the final forging lower tire mold is divided into an upper frustum and a lower frustum. The upper diameter of the upper frustum is φ800mm and the lower diameter is φ526mm. The upper diameter of the lower frustum is φ526mm and the lower diameter is φ508mm. There is a positioning protrusion in the center of the tire mold lower pad.

[0069] (8) Use a square anvil for center spinning with a square anvil width of 500 mm and spin to a workpiece height of 520 mm to obtain a gas turbine disk forging.

[0070] In this embodiment, in the tire die forging manufacturing method, the process flow diagram of the tire die forging process of steps (4)-(5) and steps (7)-(8) is as follows: Figure 1 shown.

[0071] In this embodiment, the equivalent strain of each region of the obtained gas turbine disk forging is 0.3-0.5, and the equivalent strain diagram is shown in FIG. Figure 2 As shown, the deformation is 26-40%, the minimum deformation of the final forming is 26%, the overall deformation is uniform, there is no deformation dead zone, and the grain size is measured at 3 points on each end surface of the forging, and the grain size is level 3-4.

[0072] Example 2

[0073] This embodiment provides a die forging manufacturing method for a gas turbine disc.

[0074] In this embodiment, the raw material of the gas turbine disc is high temperature alloy GH2132 material.

[0075] In this embodiment, a φ630 mm ingot is used as the forging raw material for the gas turbine disk, and the ingot is prepared by induction furnace melting (IM), ladle refining (LF), vacuum degassing (VD) and consumable electrode melting (VAR) processes.

[0076] In this embodiment, the net weight of the prepared gas turbine disc forging is 1600 kg.

[0077] The tire die forging manufacturing method comprises the following steps:

[0078] (1) Cutting and chamfering the ingot;

[0079] (2) The ingot is heated and subjected to three upsetting passes, with a deformation of 30% in a single upsetting pass. During the upsetting process, the lengthening reduction in a single pass is 90 mm. After the upsetting process, the ingot is air-cooled and forged into a φ450 mm forged bar.

[0080] (3) Cutting, peeling and chamfering the forged bars;

[0081] (4) The forged rod is heated to 1000°C, and the holding time is 0.5 min / mm based on the length of the forged rod. The forged rod is placed vertically in the pre-forging lower mold along the length direction. The temperature under the pre-forging lower mold is 200°C. A 5000T hydraulic press is used to press the forged rod as a whole, and the pressing amount is 480 mm;

[0082] The inner diameter of the top surface of the pre-forging lower tire mold is φ710mm, the inner diameter of the bottom surface is φ456mm, the overall height of the pre-forging lower tire mold is 395mm, and the inner cavity shape is divided into an upper frustum and a lower frustum. The upper diameter of the upper frustum is φ710mm and the lower diameter is φ485mm. The upper diameter of the lower frustum is φ485mm and the lower diameter is φ456mm. The height of the lower frustum is 295mm.

[0083] (5) Then, a punch is used in the pre-forging lower die to press the forging rod in the center at a pressing speed of 40 mm / s and a pressing amount of 30 mm to obtain a pre-forged part;

[0084] The upper surface diameter of the punch is φ500mm, the lower surface diameter is φ340mm, the shape is divided into an upper cylindrical part and a lower truncated cone, the overall height of the punch is 200mm, and the height of the truncated cone part is 88mm;

[0085] (6) The pre-forging is subjected to homogenization heat treatment at a temperature of 980° C. and a holding time of 0.5 min / mm+1.8 h based on the height of the pre-forging;

[0086] (7) machining a φ100×50 mm positioning blind hole at the center of the lower end face of the pre-forging, heating the pre-forging to 960° C., holding the pre-forging for 0.5 min / mm based on the height of the pre-forging, vertically placing the pre-forging into the final forging lower die along the height direction, heating the temperature of the final forging lower die to 200° C., pressing down with the punch at a speed of 40 mm / s, with a pressing amount of 150 mm, and removing the punch;

[0087] The final forging lower tire mold includes a tire mold and a tire mold lower pad. The inner diameter of the tire mold top surface is φ800mm, the inner diameter of the bottom surface is φ508mm, the inner cavity height of the final forging lower tire mold is 338mm, and the inner cavity shape of the final forging lower tire mold is divided into an upper frustum and a lower frustum. The upper diameter of the upper frustum is φ800mm and the lower diameter is φ526mm. The upper diameter of the lower frustum is φ526mm and the lower diameter is φ508mm. There is a positioning protrusion in the center of the tire mold lower pad.

[0088] (8) Use a square anvil for center spinning with a width of 500 mm and spin to a workpiece height of 520 mm to obtain a gas turbine disk forging.

[0089] Example 3

[0090] This embodiment provides a die forging manufacturing method for a gas turbine disc.

[0091] In this embodiment, the raw material of the gas turbine disc is high temperature alloy GH2132 material.

[0092] In this embodiment, a φ630 mm ingot is used as the forging raw material for the gas turbine disk, and the ingot is prepared by induction furnace melting (IM), ladle refining (LF), vacuum degassing (VD) and consumable electrode melting (VAR) processes.

[0093] In this embodiment, the net weight of the prepared gas turbine disc forging is 1600 kg.

[0094] The tire die forging manufacturing method comprises the following steps:

[0095] (1) Cutting and chamfering the ingot;

[0096] (2) The ingot is heated and subjected to three upsetting passes, with a deformation of 40% in a single upsetting pass. During the upsetting process, the lengthening reduction in a single pass is 90 mm. After the upsetting process, the ingot is air-cooled and forged into a φ450 mm forged bar.

[0097] (3) Cutting, peeling and chamfering the forged bars;

[0098] (4) The forged rod is heated to 1050°C, and the holding time is 0.8 min / mm based on the length of the forged rod. The forged rod is placed vertically in the pre-forging lower mold along the length direction. The temperature under the pre-forging lower mold is 300°C. A 5000T hydraulic press is used to press the forged rod as a whole, and the pressing amount is 520 mm;

[0099] The inner diameter of the top surface of the pre-forging lower tire mold is φ710mm, the inner diameter of the bottom surface is φ456mm, the overall height of the pre-forging lower tire mold is 395mm, and the inner cavity shape is divided into an upper frustum and a lower frustum. The upper diameter of the upper frustum is φ710mm and the lower diameter is φ485mm. The upper diameter of the lower frustum is φ485mm and the lower diameter is φ456mm. The height of the lower frustum is 295mm.

[0100] (5) Then, a punch is used in the pre-forging lower die to press the forging rod in the center at a pressing speed of 50 mm / s and a pressing amount of 50 mm to obtain a pre-forged part;

[0101] The upper surface diameter of the punch is φ500mm, the lower surface diameter is φ340mm, the shape is divided into an upper cylindrical part and a lower truncated cone, the overall height of the punch is 200mm, and the height of the truncated cone part is 88mm;

[0102] (6) The pre-forging is subjected to homogenization heat treatment at a temperature of 1020° C. and a holding time of 0.8 min / mm+2.2 h based on the height of the pre-forging;

[0103] (7) machining a φ100×50 mm positioning blind hole at the center of the lower end face of the pre-forging, heating the pre-forging to 1000° C., holding the pre-forging for 0.8 min / mm based on the height of the pre-forging, vertically placing the pre-forging into the final forging lower die along the height direction, heating the temperature of the final forging lower die to 300° C., pressing down with the punch at a speed of 50 mm / s, with a pressing amount of 170 mm, and removing the punch;

[0104] The final forging lower tire mold includes a tire mold and a tire mold lower pad. The inner diameter of the tire mold top surface is φ800mm, the inner diameter of the bottom surface is φ508mm, the inner cavity height of the final forging lower tire mold is 338mm, and the inner cavity shape of the final forging lower tire mold is divided into an upper frustum and a lower frustum. The upper diameter of the upper frustum is φ800mm and the lower diameter is φ526mm. The upper diameter of the lower frustum is φ526mm and the lower diameter is φ508mm. There is a positioning protrusion in the center of the tire mold lower pad.

[0105] (8) Use a square anvil for center spinning with a width of 500 mm and spin to a workpiece height of 520 mm to obtain a gas turbine disk forging.

[0106] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A die forging method for a gas turbine disc, characterized in that: The tire die forging manufacturing method comprises the following steps: (1) heating the ingot and performing upsetting to obtain a forged rod; (2) heating the forging rod to a pre-forging temperature and pre-forging in a pre-forging lower die, wherein the pre-forging includes first pressing the forging rod as a whole along the length direction of the forging rod with a press, and then pressing the rod in the center with a punch to obtain a pre-forged part; (3) subjecting the pre-forged part to homogenization heat treatment; (4) The pre-forged piece after the homogenization heat treatment is heated to the final forging temperature, and final forging is performed in a final forging lower die. The final forging includes first pressing the pre-forged piece in the height direction with the punch, and then spinning it with a square anvil to obtain the gas turbine disc.

2. The tire die forging manufacturing method according to claim 1, characterized in that: The upsetting in step (1) is performed 2-4 times; Preferably, the deformation amount of a single upsetting pass in step (1) is 30-40%.

3. The tire die forging manufacturing method according to claim 1 or 2, characterized in that: The pre-forging temperature in step (2) is 1000-1050° C. Preferably, the holding time of the pre-forging temperature in step (2) is 0.5-0.8 min / mm based on the length of the forged rod.

4. The tire die forging manufacturing method according to any one of claims 1 to 3, characterized in that: The overall downward pressure in step (2) is 480-520 mm; Preferably, in the pre-forging of step (2), the temperature of the pre-forging lower tire mold is 200-300° C. Preferably, the inner cavity shape of the pre-forging lower tire mold in step (2) is divided into an upper frustum and a lower frustum, the upper diameter of the upper frustum is larger than the lower diameter, the upper diameter of the lower frustum is larger than the lower diameter, and the lower diameter of the upper frustum is the same as the upper diameter of the lower frustum.

5. The tire die forging manufacturing method according to any one of claims 1 to 4, characterized in that: The pressing speed of the centering pressing in step (2) is 40-50 mm / s; Preferably, the pressing amount of the centering pressing in step (2) is 30-50 mm; Preferably, the forming part of the punch in step (2) is in the shape of a frustum, and the upper diameter of the frustum is larger than the lower diameter.

6. The tire forging manufacturing method according to any one of claims 1 to 5, characterized in that: The temperature of the homogenization heat treatment in step (3) is 980-1020°C; Preferably, the holding time of the homogenization heat treatment in step (3) is 0.5-0.8 min / mm+(1.8-2.2) h based on the height of the pre-forging.

7. The tire die forging manufacturing method according to any one of claims 1 to 6, characterized in that: The final forging temperature in step (4) is 960-1000° C. Preferably, the holding time of the final forging temperature in step (4) is 0.5-0.8 min / mm based on the height of the pre-forged piece.

8. The tire die forging manufacturing method according to any one of claims 1 to 7, characterized in that: The centering and pressing speed in step (4) is 40-50 mm / s; Preferably, the amount of downward pressure for centering in step (4) is 150-170 mm.

9. The tire forging manufacturing method according to any one of claims 1 to 8, characterized in that: In the final forging of step (4), the temperature of the final forging lower mold is 200-300° C. Preferably, the inner cavity shape of the final forging lower tire mold in step (4) is divided into an upper frustum and a lower frustum, the upper diameter of the upper frustum is larger than the lower diameter, the upper diameter of the lower frustum is larger than the lower diameter, and the lower diameter of the upper frustum is the same as the upper diameter of the lower frustum.

10. The tire die forging manufacturing method according to any one of claims 1 to 9, characterized in that: The raw material of the gas turbine disc includes high-temperature alloy GH2132, and the composition includes, by mass percentage, Ni 24.00-27.00wt%, Mo 1.00-1.50wt%, Cr 13.50-16.00wt%, Ti 1.90-2.35wt%, V 0.10-0.50wt%, B 0.003-0.010wt%, C≤0.08wt%, Si≤0.30wt%, Mn≤0.25wt%, P≤0.25wt%, S≤0.25wt%, Al≤0.35wt%, Cu≤0.50wt%, Co≤1.00wt%, and the balance is Fe.

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